Donegal Celtic 0-3 Linfield
Mark McAllister, Peter Thompson and Jamie Mulgrew were on target as champions Linfield beat Donegal Celtic.
Striker McAllister raced through in the 15th minute to slot a low shot past home keeper John Connolly.
Philip Lowry's header then forced a good save by Connolly while Donegal Celtic's Sean Cleary struck an upright with a long-range shot.
Thompson found room in the area to fire in Linfield's second before Mulgrew ran through to make it 3-0 late on.
It was front man Thompson's third league goal of the season, the other two having come in the 4-0 home win over DC in August.
The result made it back-to-back wins for the Premiership title holders who may be finding a bit of form after a sticky start to the campaign.
"I thought the performance was first class," said Blues manager David Jeffrey.
"We knew we would be up against a committed Donegal Celtic side and our players had to be up for the challenge.
"Both sides had spells in the first half but I felt we should have come in more than 1-0 up at half-time.
"Donegal Celtic tested us in the second half but my players responded well by scoring two more goals and keeping a clean sheet."